Passage Four
Initial voyages into space introduced questions scientists had never before considered. Could an astronaut swallow food in zero gravity To keep things simple, astronauts on the Project Mercury ate foods squeezed out of tubes. It was like serving them baby food in a toothpaste container.
But these early tube meals were flavorless, and astronauts dropped too many pounds. "We know that astronauts have lost weight in every American and Russian manned flight," wrote NASA scientists Malcolm Smith in 1969. "We don’t know why." Feeding people in space was not as easy as it looked.
Floating around in space isn’t as relaxing as it might sound. Astronauts expend a lot of energy and endure extreme stresses on their bodies. Their dietary requirements are therefore different from those of their gravity-bound counterparts on Earth. For example, they need extra calcium to compensate for bone loss. ’A low-
A. They had to be eaten from a bag.
B. They tasted better than they looked.
C. They could not make eating as easy as possible.
D. They were not nutritious enough for astronauts.
Passage Four
Initial voyages into space introduced questions scientists had never before considered. Could an astronaut swallow food in zero gravity To keep things simple, astronauts on the Project Mercury ate foods squeezed out of tubes. It was like serving them baby food in a toothpaste container.
But these early tube meals were flavorless, and astronauts dropped too many pounds. "We know that astronauts have lost weight in every American and Russian manned flight," wrote NASA scientists Malcolm Smith in 1969. "We don’t know why." Feeding people in space was not as easy as it looked.
Floating around in space isn’t as relaxing as it might sound. Astronauts expend a lot of energy and endure extreme stresses on their bodies. Their dietary requirements are therefore different from those of their gravity-bound counterparts on Earth. For example, they need extra calcium to compensate for bone loss. ’A low-
A. was an unusual problem among astronauts
B. was what puzzled the early scientists
C. caused new problems in space flights
D. drew the attention of the general public
The following four sentences present four different usages of the word 不过. Please discuss the distinctions and connections among the four usages, illustrating your points with your own examples where necessary.
1)不过二年，君必无患。
2)他十七岁就结婚，一年后当了爸爸，不过十八岁。
3)这是个乖巧不过的孩子。
4)我也没有长策，不过这种事情，其事已迫，不能计出万全的。
我来回答:
